Projection lens with high resolution and reduced overall length

Details Projection lens with high resolution and reduced overall length Projection lens with high resolution and reduced overall length

2007-12-12

2009-08-25

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S691000

Reexamination Certificate

active

07580194

ABSTRACT:
An exemplary projection lens includes, in this order from the screen-side thereof, a negative lens group having negative refraction of power, and a positive lens group having positive refraction of power. The positive and negative lens groups each include a number of positive and negative lenses. The focal length of the projection lens is adjustable. The projection lens satisfies the formulas of: −2<F1/Fw<−1.6; 1.2<F2/Fw<1.4; and Vg2>56, where F1, and F2 respectively represent the effective focal lengths of the negative lens group and the positive lens group, Fw is the shortest effective focal length of the projection lens, and Vg2 is the average of the Abbe numbers of the positive lenses in the positive lens group.

REFERENCES:
patent: 5550679 (1996-08-01), Sugawara
patent: 5644435 (1997-07-01), Shikama
patent: 6147812 (2000-11-01), Narimatsu et al.
patent: 6671104 (2003-12-01), Endo
patent: 7038857 (2006-05-01), Kuo
patent: 2006/0092525 (2006-05-01), Sato et al.
patent: 2007/0058267 (2007-03-01), Kawana

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